Changing hydraulic lines in GC series backhoe boom cylinder

Johnny_B · May 25, 2016

I recently replaced the two hoses inside the boom on my CB05 backhoe for the GC2410. It was easier than I thought it would be, so I figured I'd pass on a little info in case anyone else needs to do this. One OEM hose was leaking, but I replaced both with higher quality hose (an ounce of prevention).

Parts: Both hoses inside the boom are identical. A local hydraulic shop made me two 80-inch hoses: 1/4 ID, with JIC 37 degree female swivel fittings (size -06), 5800 PSI (OEM was 3000 PSI, but I wanted a more durable hose).

I also bought a roll of nylon hose protector to feed the hoses through (and secured with cable zip ties). The little open area in the boom where the hoses come through is where the OEM hose rubbed on a sharp edge and failed. So hopefully using the nylon sleeve will help prevent this in the future. They use this elsewhere on the backhoe, but not in this area.

Step 1. Remove the cover on the backhoe controls, label the old hoses (I simply used A and B).

Step 2. Extend the backhoe as far out as possible. I used car ramps to raise the back tires up a few more inches so I could extend the hoe down a few more inches (the ramps may not be necessary, but it gave me a few more inches to work inside the boom when removing the cylinder).

Step 3. I removed the pin furthest from the tractor (the pin in the boom). This was done by removing the retaining bolt and then tapping the pin with a large brass punch and handheld mini-sledge. The pin was a lot easier to remove than I anticipated, and any type of large wooden/plastic dowel could have probably been used. It didnç¨š take much force to lose/remove them.

Step 4. Retract the hydraulic boom cylinder using the backhoe controls. Once I did this I was going to try and leave the front pin (closest to the tractor) connected and just reach inside the boom to access the fittings, but it was still a little tight, so I removed the front pin and then removed the cylinder. I disconnected both hoses and set the cylinder out of the way.

Step 5. Disconnect the hoses from the controls (and take them to your local shop to have them make duplicates). Label the new hoses (A and B). Reconnect the new hoses at the controls, feed them through the new nylon hose connector and into the boom.

Step 6. Connect the hoses to the cylinder and put the cylinder back inside the boom. Reconnect the pin closest to the tractor, and then use the backhoe controls to extend the cylinder inside the boom.

Step 7. The trickiest part is lifting the front end of the cylinder to line up where the pin goes through. I used a small block of wood to help prop it up and then I got a smaller diameter rod (I had a piece of 3/8 aluminum rod lying around) to use as a pilot to push through and help line up the cylinder hole. This kept the cylinder just about in place while I re-installed the pin. Make sure you re-install all the retaining bolts and re-grease the pins you just re-installed.

Step 8. Install the cover over your controls and check/fill your hydraulic fluid level as necessary.

ray66v · May 25, 2016

Thanks for that detailed post.

No one local seems to even sell 3000 psi hose.

You either replace them one at a time, and hope it doesn't break when you really need it.

Or, you break the bank, and replace them all at once.

Rocko · May 25, 2016

Thanks for the Great Post.
I'm sure this will come in very handy someday.
subscribed.

Johnny_B · May 26, 2016

ray66v said:
Thanks for that detailed post.

No one local seems to even sell 3000 psi hose.

You either replace them one at a time, and hope it doesn't break when you really need it.

Or, you break the bank, and replace them all at once.

Same experience for me. Both shops I've visited have double-wire in the 5000 PSI range, they didn't carry anything like the single wire 3000 PSI OEM hoses.

Speaking of breaking the bank, I had a "you gotta be f'in kidding me" moment last night...As I was disconnecting the hoe so I could mow the grass, I noticed another outrigger hose had a slow leak (slightly worn from rubbing and the wire braiding was rusty and leaking)...so I ordered new custom hoses (seven more) for all the remaining backhoe lines...it wasn't cheap, but at least it will be done.

Johnny_B · May 26, 2016

Here is the list of hose lengths from the AGCO Parts Book. If you use this info, please confirm before ordering.

Hydraulic Hose AGCO # Length
Left outrigger (upper mount) SL158888 50"
Left outrigger (lower mount) SL158888 50"
Right outrigger (upper mount) SL158888 50"
Right outrigger (lower mount) SL158888 50"

Bucket cylinder (farthest mount) 71516103 128"
Bucket cylinder (closest mount) 71516104 112"

Dipper (looped line) 71516091 102"
Dipper (non-loop) 71516105 95"

Boom (closest to tractor) 71515693 80"
Boom (furthest from tractor) 71515693 80"

exohomestead · Aug 4, 2016

Johnny_B said:
Here is the list of hose lengths from the AGCO Parts Book. If you use this info, please confirm before ordering.

Which backhoe model? Mine is a 2375 on the back of a GC2310. I noticed it was different than the one in the original posting.

exohomestead · Aug 4, 2016

Slightly off topic, but...

Have I been using my outriggers wrong? I put the flat side down toward the dirt. In the first picture, you have the flat side up.

cglaser104 · Aug 4, 2016

Flat side down on hard surfaces like blacktop or concrete....toothy side down on dirt, grass or any other 'soft' surface

Racer4 · Oct 29, 2024

Went to use my backhoe today (GC2410, CB05 hoe) to pull some rotting 8x12 beams out of the pile to cut them up to fit in the dumpster. Pushed the boom lever down to dig the teeth into the beam and I hear what sounds like a pressure washer inside the boom, and oil is pouring out the bottom.

Hose burst. Got another leaking at the bucket curl cylinder too.

Going to replace all 6 on the boom as they’re all 3000 psi, single wire. Looking into 5800 psi, 2 wire from online. Machine is 14 years old, so I might as well replace them all.

Got the boom disconnected from the pivot and got the cylinder out of the boom with hoses attached. All the other hoses are accessible without taking anything else apart. Just have to get them out of the channel in the boom and measure them all. Then figure out what exact fittings are on each one.

Not what I expected to deal with today. Now both garage bays are tied up until I order, then receive and install the new ones.